Sound-absorbing and vibration-reducing sheet for passenger cabin of ship

Abstract

The invention provides a sound-absorbing and vibration-reducing sheet for a passenger cabin of a ship, which comprises an arc-shaped composite sheet, and a plurality of sound-absorbing grooves tangent to the arc surface of the arc-shaped composite sheet are formed in the arc-shaped composite sheet; the sound-absorbing groove comprises a first cavity and a second cavity which are sequentially formed from the outer side to the inner side of the arc-shaped composite sheet and are communicated with each other, an elastic film layer for isolating the first cavity from the second cavity is arranged at the inner end of the first cavity, and a mass block is embedded in the center of the elastic film layer; a composite fiber layer is adhered to one side, deviating from the second cavity, of the elastic film layer; the second cavity comprises an outer cavity connected with the first cavity and an inner cavity, a telescopic adjusting rod is fixedly arranged in the center of the bottom end of the inner cavity, and an end block is arranged at the free end of the telescopic adjusting rod; and a closed cavity is formed between the end block and the elastic film layer. According to the invention, the noise of different frequencies can be effectively absorbed, and the best vibration and noise reduction effect is achieved.

Description

technical field [0001] The invention relates to the technical field of noise reduction in a ship's cabin, and more particularly relates to a sound-absorbing and vibration-damping sheet for a ship's cabin. Background technique [0002] With the rapid development of the shipbuilding industry, the noise problem of the propulsion main engine and diesel generator set in the ship engine room is becoming more and more serious. Since the propulsion power of the ship and the generator set are arranged in the narrow engine room, the two major noise sources in the engine room: the noise of the propulsion main engine and the noise of the generator set make the working environment in the engine room very bad. In addition, the work of the crew in the engine room Therefore, this strong noise not only seriously affects the work efficiency of the crew, damages their physical and mental health, but also seriously pollutes the surrounding sound environment. Ship noise is the uncomfortable sou...

AI Technical Summary

Problems solved by technology

The noise in the engine room is composed of the noise of the propulsion main engine and the noise of the diesel generator set. The noise in the control room of the ship engine room is mainly reflected in the mechanical energy transmitted in the form of waves, and is transmitted by the second noise source such as the cabin and sub-pieces in the form of air noise. Many ship engine rooms often use sound insulation covers to reduce the noise transmitted by diesel generator sets during operation. When the ventilation conditions of the engine room permit, use sound insulation covers to isolate the entire unit. According to actual measurements, use sound insulation covers In the future, although the noise has been reduced, the effect is not too obvious

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